20 Most Recent 2002 Yamaha DT 125 R Questions & Answers


Hi, Joseph and the usual suspects are:
1. Engine oil level and SAE weight are too low or not circulating.
2. Insufficient or blocked airflow over the engine.
3. Heavy combustion chamber carbon deposits.
4. Ignition timing retarded due to a faulty MAP, CKP, or CMP sensor.
5. Carburetor jetted too lean.
6. Leaking intake or exhaust valve.
7. Clutch slipping, brakes dragging, heavy load, towing a trailer.
8. Idling too long without moving.
9. Constant hot weather temperatures, mountain, or desert riding conditions consider adding an oil cooler and or cylinder head cooler.
10. Ignition timing retarded.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Overheating DT125R Help pls
Overheating Dt125R
Yamaha DT125RE 2005 Service Manual
https://www.partsfish.com/page/oem-parts-for-yamaha
YAMAHA DT125R Owner Manual

2002 Yamaha DT... | Answered on Nov 14, 2018


Hi, Anonymous sorry you can't find the first and best tool you ever bought for your Yamaha despair, not for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf
OEM parts for Yamaha
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
Yamaha DT 125 LCII CDi teszt
yamaha DT125R CDI box location Google Search

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


2002 Yamaha DT... | Answered on Mar 14, 2016


Hi, Anonymous for more information about your question and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
yamaha DT125R CDI box location Google Search
https://www.youtube.com/watch?v=ngWFZtbmbag
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


2002 Yamaha DT... | Answered on Mar 14, 2016


Hi, Terry sorry you can't find the first and best tool you ever bought for your Yamaha despair, not for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
Power Valves
Aprilia RS125 How to Remove Clean Re Assemble RAVE Powervalve Rotax 122
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


2002 Yamaha DT... | Answered on Mar 14, 2016


Hi, Gocartracerd sorry you can't find the first and best tool you ever bought for your Yamaha despair, not for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
https://yamahaclub.com/forums/topic/32738-dtr-125-help-again-please
How to Get Your 2 stroke Idle Perfect YZ125
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


2002 Yamaha DT... | Answered on Mar 14, 2016


Hi, Griffinkarren "WOOPS" for more information about your question and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
https://yamahaclub.com/forums/topic/21295-overheating-dt125r-help-pls
DT 125 overheating
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
Yamaha Motorcycle Parts Spares From Europes Number 1 MSP
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

2002 Yamaha DT... | Answered on Mar 13, 2016


Take radiator cap of start bike fill with water and coolent when bubbles stop eg when thermostat opens put cap back on done done start bike then take cap of any u no that like every 1 does hope it helps

2002 Yamaha DT... | Answered on Mar 12, 2016


Hi, M_turnbull sorry you can't find the first and best tool you ever bought for your Yamaha despair, not for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
https://yamahaclub.com/forums/topic/32738-dtr-125-help-again-please
Idle mixture adjustment air or fuel ***** adjustment
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


2002 Yamaha DT... | Answered on Mar 11, 2016


Hi, Anonymous sorry you can't find the first and best tool you ever bought for your Yamaha despair, not for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
Yamaha DT125R Cdi wiring diagram coils stator Google Search
Wiring Diagram
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

2002 Yamaha DT... | Answered on Mar 11, 2016


Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. If necessary, transport your bike to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your problem. For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
https://www.tradebit.com/filedetail.php/199056912-1990-yamaha-xt-600-a-ac-service
OEM parts for Yamaha
Yamaha XT500E Owner Manual
Yamaha XT 600 1990
http://www.dirtntrial.com/tuning.htm

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

2002 Yamaha DT... | Answered on Mar 11, 2016


Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. If necessary, transport your bike to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your problem. For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
Derestricting the Yamaha DT125R 1988 through to 2007
How to Derestrict Yamaha DT 125 RE
DT 125 de restricting
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


2002 Yamaha DT... | Answered on Mar 11, 2016


Hi, Anonymous sorry you can't find the first and best tool you ever bought for your Yamaha despair, not for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
Yamaha DT 125 CDI Wiring and Circuit Diagram Circuit Wiring Diagrams
Wiring Diagram
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

2002 Yamaha DT... | Answered on Mar 11, 2016


Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. If necessary, transport your bike to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your problem. For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
http://motocrosshideout.com/2011/08/19/why-is-coolant-coming-out-the-overflow-tube
https://yamahaclub.com/forums/topic/19089-dt125r-overheating-and-coolant-problems
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

2002 Yamaha DT... | Answered on Mar 11, 2016


Check the side stand safety switch its may be stuck or faulty.

2002 Yamaha DT... | Answered on Nov 03, 2012


Hi there, you likely still have the restrictor in the exhaust header. Mine was the same, they are shipped like that as standard. Take the exhaust off the engine and remove the the concentric tube that's in there (you need to cut it out). Instant +100% power, if that is your problem.

2002 Yamaha DT... | Answered on Mar 05, 2012


Usually this is caused by the air/fuel mixture not being optimal. Try adjusting the carburetor.

Please see the following link for an example.

http://www.youtube.com/watch?v=aUNU0G-Ofj4

If that does not work, check the spark plugs, they may be fouled.

Hope this helps!

2002 Yamaha DT... | Answered on Sep 06, 2011


Clean out your cooling system, flush it and make sure the radiator is not clogged. You could be overheating due to a clogged up radiator. If you put your hand on the radiator, it should be the same temperature all around. If clogged up it will be colder in the middle and very hot where the water comes in from the engine. CAUTION not to burn yourself, use of IR thermometer recommended.
If that's not it, then check your head gaskets.

2002 Yamaha DT... | Answered on Oct 19, 2009


yer change ya gear box oil and get all the old fuel out. just basicly anything you can clean or change do it!!! air filter,oil filter,water,spark plug and so on...and when you first start it let it warm up for bout 5 mins but no longer.

2002 Yamaha DT... | Answered on Jul 05, 2009

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